Compositions and methods for cell transplantation

a cell transplantation and cell technology, applied in the field of tissue regeneration, can solve the problems of unsatisfactory bloodstream modification, loss of transplanted cells, and reduction of cell engraftment potential and/or thrombotic events,

Active Publication Date: 2015-02-05
UNIVERSITE CATHOLIQUE DE LOUVAIN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0010]The inventors therefore investigated manners to counteract the procoagulant activity of transplanted cells and found that concomitant or associated administration of cells having procoagulant activity with a factor Xa inhibitor and a thrombin inhibitor, preferably a direct factor Xa inhibitor and a thrombin inhibitor, provides a particularly effective and safe combination for preventing deleterious procoagulant effects. Surprisingly, whereas concomitant administration of cells having procoagulant activity with either one of a factor Xa inhibitor, preferably a direct factor Xa inhibitor, or a thrombin inhibitor alone does not adequately prevent thrombotic events at physiologically acceptable concentrations of respectively the (direct) factor Xa inhibitor or thrombin inhibitor, the combination of the factor Xa inhibitor together with the thrombin inhibitor, preferably the direct factor Xa inhibitor and the thrombin inhibitor, can advantageously prevent cell therapy-induced thrombosis and thrombosis associated complications (e.g., local thrombosis and induction of local inflammation). Accordingly, the inventors realised a particularly advantageous and even synergistic combination therapy and clinical protocols useful for reducing procoagulant activity of transplanted cells, in particular stem and progenitor cells.
[0067]The use of a direct factor Xa inhibitor may offer advantages compared to the use of an indirect factor Xa inhibitor, in that an indirect factor Xa inhibitor may have multiple targets, and thereby its use may possibly result in off-target effects.
[0071]In an embodiment, the thrombin inhibitor is selected from the group consisting of bivalirudin, hirudin, lepirudin, desirudin, argatroban, melagatran, ximelagatran, and dabigatran, preferably selected from the group consisting of bivalirudin, and hirudin, even more preferably bivalirudin. Advantageously, bivalirudin has a comparably short half live of about 35 to about 40 minutes, thereby allowing for a prompt return of a subject to a normal haemostasis status.

Problems solved by technology

The procoagulant activity of stem and progenitor cells may be of concern for transplantation of these cells, in particular may cause undesired bloodstream modifications, loss of the transplanted cells, reduction of the cell engraftment potential and / or thrombotic events.
Moreover, this procoagulant activity cannot be controlled by unfractionated heparin, the conventional anticoagulant for hepatocyte transplantation.

Method used

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  • Compositions and methods for cell transplantation
  • Compositions and methods for cell transplantation
  • Compositions and methods for cell transplantation

Examples

Experimental program
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example 1

Materials and methods

[0196]The protocol, including all experiments on human samples, and the human off label anticoagulant protocol use, and the informed consents were approved by the institution ethical review board.

Cell Preparations

[0197]hALPC cells were obtained from healthy liver donors (n=6, aged 9 to 44 years) as previously described (Najimi et al., Cell Transplant. 2007; 16:717-728). Cells were studied freshly trypsinised or after cryopreservation / thawing at passages 4 to 6. Cells were suspended in an albumin solution containing or not containing heparin at a concentration of 10 U / mL (or more when specified). We also used, as a control, cryopreserved / thawed human hepatocytes (n=5, aged 16 to 44 years). Liver isolation and hepatocyte cryopreservation / thawing procedures were previously published in detail (Sokal et al., Transplantation. 2003; 76:735-738).

[0198]Bone marrow samples were collected by aspiration of vertebrae or iliac crests of 3 post-mortem organ donors aged 8 to 6...

example 2

Procoagulant Activity of Adult-Derived Human Liver Mesenchymal Stem Cells (hALPCs)

[0218]We demonstrated the procoagulant activity (PCA) of human adult liver progenitor cells (hALPCs) by thromboelastometry method on human blood and plasma. Clotting time (CT) of hALPCs was less than that of hepatocytes as evaluated in the thromboelastogram (in blood, 117.5±33.8 sec (n=15) vs. 285.8±87.0 sec (n=11), p<0.001) (in plasma, 112.6±18.4 sec (n=9) vs. 363.0±180.1 sec (n=5), p<0.05) (FIGS. 1A and 1B). The control CT, without addition of cells, was measured at 646.2±111.7 sec (n=15) in blood and at 781.9±150.5 (n=9) in plasma. A comparable PCA of hALPCs was observed when no extrinsic TF was added (FIG. 2). No PCA was obtained when the hALPCs culture medium, absence of cells, was placed in the thromboelastogram instead of cells (FIG. 3).

[0219]We also evaluated the PCA of hALPCs in the tubing loop model. Decrease of platelets count and increase of D-Dimers levels were observed after incubation of...

example 3

Procoagulant Activity of Mesenchymal Cells

[0220]We also demonstrated the PCA of bone marrow mesenchymal stem cells (279.3±108.3 sec (n=3)), skin fibroblasts (121.8±26.53 sec (n=3)) and liver myofibroblasts (61.7±7.6 sec (n=3)) by thromboelastometry method on human whole blood. Bone marrow haematopoeitic stem cells were used as a control of non procoagulant cells (590.7±25.3 sec (n=3)) (FIG. 4).

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Abstract

The present invention relates to compositions and methods for cell transplantation. In particular, the present invention provides a composition comprising procoagulant cells and at least one factor Xa inhibitor, preferably rivaroxaban, as well as at least one thrombin inhibitor, preferably bivalirudin.

Description

FIELD OF THE INVENTION[0001]The present invention relates to the field of tissue regeneration in general and cell transplantation in particular. The present invention is directed at compositions and methods for improving cell transplantation and particularly for inhibiting procoagulant activity associated with cell transplantation.BACKGROUND OF THE INVENTION[0002]Various conditions caused by diseased or otherwise damaged or functionally impaired organs may be treated by organ transplantations. In particular, transplantation of heart, kidneys, liver, lungs, pancreas, intestine, and thymus can routinely be performed with a reasonable rate of success. A major drawback in organ transplantation however remains the need to find a compatible donor for each recipient patient, since incompatibility between the donor and recipient may result in rejection of the transplanted organ. Transplant rejection can be reduced through serotyping to determine the most appropriate donor-recipient match an...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K38/58A61K31/5377A61K35/407A61K35/28
CPCA61K38/58A61K31/5377A61K35/407A61K45/06A61K35/28A61P1/06A61P7/02A61P9/10A61K2300/00
Inventor STEPHENNE, XAVIERSOKAL, ETIENNENAJIMI, MUSTAPHAEECKHOUDT, STEPHANEHERMANS, CEDRIC
Owner UNIVERSITE CATHOLIQUE DE LOUVAIN
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